I'm no expert, but most of what I've read break in is around 200-300 miles "250 is a safe medium". So you're close but if you've taken the time too break it in, why chance it on the home stretch. After the break in synthetic is fine.

My way of thinking is when your breaking your engine in u want it to wear(bed-in individual components) BUT when it's broken-in u don't want it to wear.This same principle i apply with 4-strokes..............YOU decide. :detective: